Step stool



FIG. 1 is a front perspective view of a step stool showing my design;

FIG. 2 is a cross sectional view of FIG. 1 along the line 2--2 of FIG. 3.

FIG. 3 is a rear view of FIG. 1.

FIG. 4 is an bottom plan view of FIG. 1.

A front perspective view taken from the right side of the stool would be a mirror image of the left front perspective view of FIG. 1. 

The ornamental design for a step stool, as shown and described. 